Launched at Chelsea 2018 Tranquilite has the palest blue flowers with ruffled edges to the petals that fade to almost white. Only  growing to around 1.2m x 1m and flowering from late spring until late autumn it is a worthy subject for any garden. Really good at brightening up a dull area of the garden. Best grown in part shade to shade. Prune back to 15cm each winter/spring. Prune group 3.